Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/dev/acpica/acpi_hpet.c
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1 /*- 2 * Copyright (c) 2005 Poul-Henning Kamp 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 */ 26 27 #include <sys/cdefs.h> 28 __FBSDID("$FreeBSD: releng/7.4/sys/dev/acpica/acpi_hpet.c 204481 2010-02-28 21:23:50Z avg $"); 29 30 #include "opt_acpi.h" 31 #include <sys/param.h> 32 #include <sys/bus.h> 33 #include <sys/kernel.h> 34 #include <sys/module.h> 35 #include <sys/rman.h> 36 #include <sys/time.h> 37 #include <sys/timetc.h> 38 39 #include <contrib/dev/acpica/acpi.h> 40 #include <dev/acpica/acpivar.h> 41 #include <dev/acpica/acpi_hpet.h> 42 43 #define HPET_VENDID_AMD 0x4353 44 #define HPET_VENDID_INTEL 0x8086 45 46 ACPI_SERIAL_DECL(hpet, "ACPI HPET support"); 47 48 static devclass_t acpi_hpet_devclass; 49 50 /* ACPI CA debugging */ 51 #define _COMPONENT ACPI_TIMER 52 ACPI_MODULE_NAME("HPET") 53 54 struct acpi_hpet_softc { 55 device_t dev; 56 struct resource *mem_res; 57 ACPI_HANDLE handle; 58 }; 59 60 static u_int hpet_get_timecount(struct timecounter *tc); 61 static void acpi_hpet_test(struct acpi_hpet_softc *sc); 62 63 static char *hpet_ids[] = { "PNP0103", NULL }; 64 65 struct timecounter hpet_timecounter = { 66 .tc_get_timecount = hpet_get_timecount, 67 .tc_counter_mask = ~0u, 68 .tc_name = "HPET", 69 .tc_quality = 900, 70 }; 71 72 static u_int 73 hpet_get_timecount(struct timecounter *tc) 74 { 75 struct acpi_hpet_softc *sc; 76 77 sc = tc->tc_priv; 78 return (bus_read_4(sc->mem_res, HPET_MAIN_COUNTER)); 79 } 80 81 static void 82 hpet_enable(struct acpi_hpet_softc *sc) 83 { 84 uint32_t val; 85 86 val = bus_read_4(sc->mem_res, HPET_CONFIG); 87 val &= ~HPET_CNF_LEG_RT; 88 val |= HPET_CNF_ENABLE; 89 bus_write_4(sc->mem_res, HPET_CONFIG, val); 90 } 91 92 static void 93 hpet_disable(struct acpi_hpet_softc *sc) 94 { 95 uint32_t val; 96 97 val = bus_read_4(sc->mem_res, HPET_CONFIG); 98 val &= ~HPET_CNF_ENABLE; 99 bus_write_4(sc->mem_res, HPET_CONFIG, val); 100 } 101 102 /* Discover the HPET via the ACPI table of the same name. */ 103 static void 104 acpi_hpet_identify(driver_t *driver, device_t parent) 105 { 106 ACPI_TABLE_HPET *hpet; 107 ACPI_TABLE_HEADER *hdr; 108 ACPI_STATUS status; 109 device_t child; 110 111 /* Only one HPET device can be added. */ 112 if (devclass_get_device(acpi_hpet_devclass, 0)) 113 return; 114 115 /* Currently, ID and minimum clock tick info is unused. */ 116 117 status = AcpiGetTable(ACPI_SIG_HPET, 1, (ACPI_TABLE_HEADER **)&hdr); 118 if (ACPI_FAILURE(status)) 119 return; 120 121 /* 122 * The unit number could be derived from hdr->Sequence but we only 123 * support one HPET device. 124 */ 125 hpet = (ACPI_TABLE_HPET *)hdr; 126 if (hpet->Sequence != 0) 127 printf("ACPI HPET table warning: Sequence is non-zero (%d)\n", 128 hpet->Sequence); 129 child = BUS_ADD_CHILD(parent, ACPI_DEV_BASE_ORDER, "acpi_hpet", 0); 130 if (child == NULL) { 131 printf("%s: can't add child\n", __func__); 132 return; 133 } 134 135 bus_set_resource(child, SYS_RES_MEMORY, 0, hpet->Address.Address, 136 HPET_MEM_WIDTH); 137 } 138 139 static int 140 acpi_hpet_probe(device_t dev) 141 { 142 ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__); 143 144 if (acpi_disabled("hpet")) 145 return (ENXIO); 146 if (acpi_get_handle(dev) != NULL && 147 (ACPI_ID_PROBE(device_get_parent(dev), dev, hpet_ids) == NULL || 148 device_get_unit(dev) != 0)) 149 return (ENXIO); 150 151 device_set_desc(dev, "High Precision Event Timer"); 152 return (0); 153 } 154 155 static int 156 acpi_hpet_attach(device_t dev) 157 { 158 struct acpi_hpet_softc *sc; 159 int rid, num_timers; 160 uint32_t val, val2; 161 uintmax_t freq; 162 uint16_t vendor; 163 164 ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__); 165 166 sc = device_get_softc(dev); 167 sc->dev = dev; 168 sc->handle = acpi_get_handle(dev); 169 170 rid = 0; 171 sc->mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 172 RF_ACTIVE); 173 if (sc->mem_res == NULL) 174 return (ENOMEM); 175 176 /* Validate that we can access the whole region. */ 177 if (rman_get_size(sc->mem_res) < HPET_MEM_WIDTH) { 178 device_printf(dev, "memory region width %ld too small\n", 179 rman_get_size(sc->mem_res)); 180 bus_free_resource(dev, SYS_RES_MEMORY, sc->mem_res); 181 return (ENXIO); 182 } 183 184 /* Be sure timer is enabled. */ 185 hpet_enable(sc); 186 187 /* Read basic statistics about the timer. */ 188 val = bus_read_4(sc->mem_res, HPET_PERIOD); 189 if (val == 0) { 190 device_printf(dev, "invalid period\n"); 191 hpet_disable(sc); 192 bus_free_resource(dev, SYS_RES_MEMORY, sc->mem_res); 193 return (ENXIO); 194 } 195 196 freq = (1000000000000000LL + val / 2) / val; 197 if (bootverbose) { 198 val = bus_read_4(sc->mem_res, HPET_CAPABILITIES); 199 200 /* 201 * ATI/AMD violates IA-PC HPET (High Precision Event Timers) 202 * Specification and provides an off by one number 203 * of timers/comparators. 204 * Additionally, they use unregistered value in VENDOR_ID field. 205 */ 206 num_timers = 1 + ((val & HPET_CAP_NUM_TIM) >> 8); 207 vendor = val >> 16; 208 if (vendor == HPET_VENDID_AMD && num_timers > 0) 209 num_timers--; 210 device_printf(dev, 211 "vend: 0x%x rev: 0x%x num: %d hz: %jd opts:%s%s\n", 212 vendor, val & HPET_CAP_REV_ID, 213 num_timers, freq, 214 (val & HPET_CAP_LEG_RT) ? " legacy_route" : "", 215 (val & HPET_CAP_COUNT_SIZE) ? " 64-bit" : ""); 216 } 217 218 if (testenv("debug.acpi.hpet_test")) 219 acpi_hpet_test(sc); 220 221 /* 222 * Don't attach if the timer never increments. Since the spec 223 * requires it to be at least 10 MHz, it has to change in 1 us. 224 */ 225 val = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER); 226 DELAY(1); 227 val2 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER); 228 if (val == val2) { 229 device_printf(dev, "HPET never increments, disabling\n"); 230 hpet_disable(sc); 231 bus_free_resource(dev, SYS_RES_MEMORY, sc->mem_res); 232 return (ENXIO); 233 } 234 235 hpet_timecounter.tc_frequency = freq; 236 hpet_timecounter.tc_priv = sc; 237 tc_init(&hpet_timecounter); 238 239 return (0); 240 } 241 242 static int 243 acpi_hpet_detach(device_t dev) 244 { 245 ACPI_FUNCTION_TRACE((char *)(uintptr_t) __func__); 246 247 /* XXX Without a tc_remove() function, we can't detach. */ 248 return (EBUSY); 249 } 250 251 static int 252 acpi_hpet_suspend(device_t dev) 253 { 254 struct acpi_hpet_softc *sc; 255 256 /* 257 * Disable the timer during suspend. The timer will not lose 258 * its state in S1 or S2, but we are required to disable 259 * it. 260 */ 261 sc = device_get_softc(dev); 262 hpet_disable(sc); 263 264 return (0); 265 } 266 267 static int 268 acpi_hpet_resume(device_t dev) 269 { 270 struct acpi_hpet_softc *sc; 271 272 /* Re-enable the timer after a resume to keep the clock advancing. */ 273 sc = device_get_softc(dev); 274 hpet_enable(sc); 275 276 return (0); 277 } 278 279 /* Print some basic latency/rate information to assist in debugging. */ 280 static void 281 acpi_hpet_test(struct acpi_hpet_softc *sc) 282 { 283 int i; 284 uint32_t u1, u2; 285 struct bintime b0, b1, b2; 286 struct timespec ts; 287 288 binuptime(&b0); 289 binuptime(&b0); 290 binuptime(&b1); 291 u1 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER); 292 for (i = 1; i < 1000; i++) 293 u2 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER); 294 binuptime(&b2); 295 u2 = bus_read_4(sc->mem_res, HPET_MAIN_COUNTER); 296 297 bintime_sub(&b2, &b1); 298 bintime_sub(&b1, &b0); 299 bintime_sub(&b2, &b1); 300 bintime2timespec(&b2, &ts); 301 302 device_printf(sc->dev, "%ld.%09ld: %u ... %u = %u\n", 303 (long)ts.tv_sec, ts.tv_nsec, u1, u2, u2 - u1); 304 305 device_printf(sc->dev, "time per call: %ld ns\n", ts.tv_nsec / 1000); 306 } 307 308 static device_method_t acpi_hpet_methods[] = { 309 /* Device interface */ 310 DEVMETHOD(device_identify, acpi_hpet_identify), 311 DEVMETHOD(device_probe, acpi_hpet_probe), 312 DEVMETHOD(device_attach, acpi_hpet_attach), 313 DEVMETHOD(device_detach, acpi_hpet_detach), 314 DEVMETHOD(device_suspend, acpi_hpet_suspend), 315 DEVMETHOD(device_resume, acpi_hpet_resume), 316 317 {0, 0} 318 }; 319 320 static driver_t acpi_hpet_driver = { 321 "acpi_hpet", 322 acpi_hpet_methods, 323 sizeof(struct acpi_hpet_softc), 324 }; 325 326 327 DRIVER_MODULE(acpi_hpet, acpi, acpi_hpet_driver, acpi_hpet_devclass, 0, 0); 328 MODULE_DEPEND(acpi_hpet, acpi, 1, 1, 1);
Cache object: 9806dbd7678079173105ec6e8010be49
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